r195676 - Make the integrated assembler the default for cygwin/mingw too.

[Rafael Espíndola]

> And if these incompatibilities are due to bugs in GNU as - please fill
> the bugs in binutils bugzilla as well.

I reported https://sourceware.org/bugzilla/show_bug.cgi?id=16279

> Somehow there were no problems
> with using GNU as for ages and now they apparently occurred...

We used to produce unique names, which is why it worked with gas. The
unique names were dropped since they are unnecessary. The sections
merging uses the comdat symbol, not the section name.

Cheers,
Rafael